1600 John F. Kennedy Blvd. Ste 1800 Phildelphia, PA 19103-2899 FELSON’S PRINCIPLES OF CHEST ROENTGENOLOGY ISBN-13: 978-1-4160-2923-6 ISBN-10: 1-4160-2923-0 Copyright © 2007 by Saunders, an imprint of Elsevier Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permissions may be sought directly from Elsevier’s Health Sciences Rights Department in Philadelphia, PA, USA: phone: (+1) 215 239 3804, fax: (+1) 215 239 3805, e-mail: